Topology Optimization of Wide‐Frequency Tunable Phononic Crystal Resonators with a Reconstructable Point Defect

Advanced Theory and Simulations, Год журнала: 2025, Номер unknown

Опубликована: Апрель 28, 2025

Abstract Phononic crystal (PnC) resonators and their dynamic regulation of wave transmission hold significant practical importance in the field acoustic energy harvesting. However, majority existing PnC are typically designed manufactured for fixed frequencies limited functionalities. Once these manufactured, achieving tunable characteristics becomes challenging. To address challenge, this study presents a topology optimization strategy based on an efficient point defect diagonally movement reconstruction mechanism. For broadest range various resonators, proposed involves use gradient‐free algorithm to successively design surrounding unit cells defects resonator, leading successful realization with customized functions. Optimization results from several examples demonstrate defect‐band frequency that covers almost entire bandgap. Furthermore, explores relationship between resonant diagonal moving distance Both numerical simulations experimental tests effectiveness creating wide‐frequency characteristics. It achieves real‐time automated resonance response changes external sound sources, offering novel approach designing harvesters within engineering domain.

Язык: Английский

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Reconfigurable multifunctional acoustic metagratings enabled by local phase harnessing

Applied Physics Letters, Год журнала: 2025, Номер 126(20)

Опубликована: Май 19, 2025

Metasurfaces and metagratings show significant potential in revolutionizing acoustic devices, with applications spanning areas such as structural health monitoring communication. Nevertheless, most previous metasurfaces are realized limited single functions, well complicated structures or low transformation efficiency, leaving the reconfigurable mode-transition reflective high efficiency largely uncharted. Here, we propose a distinctly phase-gradient metagrating (PGM) for wave reflection manipulations. We demonstrate that by harnessing only local phase PGM, multi-functionalities can be achieved, including transition from perfect retro-reflection to specular reflection. Moreover, illustrate robust full-angle incidence response conversion enabled PGM. These results have been confirmed consistent of theory, simulations, experiments. The proposed PGM its simple design, not broadens fundamental understanding diffraction order transitions but also provides an alternative avenue multi-functional information processing.

Язык: Английский

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Moiré Twisted Lieb Metasurface Enabled for All‐Magic‐Angle

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 27, 2025

Abstract Moiré metasurfaces generate novel optical characteristics, such as photonic polariton and topological Lifshitz transition by stacking multiple with periodic structures. This configuration demonstrates significant flexibility tunability in the manipulation of optical, electrical, acoustic, thermal properties. In this work, a bilayer twisted moiré elastic metasurface is presented, constructed using periodically arranged tilted rhombic prism resonators Lieb lattice configuration. By utilizing twisting mechanism, design enables systematic reconstruction metasurface, which facilitates precise wave propagation, particularly achieving both “all‐magic‐angle” anisotropic transmission. The inherent band structure plays key role reducing energy dissipation during transmission, thereby enhancing concentration. Furthermore, phenomenon unidirectional polariton‐like polarized waveguide mode observed, where propagation biased along specific directions. study establishes comprehensive theoretical framework throughderivation governing equations construction structures corresponding dispersion relations. These findings significantly enhance potential applications manipulation, critical technologies non‐destructive testing harvesting.

Язык: Английский

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Converging acoustic waves through complex media with a four-phase metalens

Journal of Applied Physics, Год журнала: 2024, Номер 136(17)

Опубликована: Ноя. 4, 2024

Wavefront shaping is an established solution to converge acoustic waves through complex media. Discrete phase sampling inevitable in practice because of manufacture resolution. Limited undermines focusing performance, which hardly improved by increasing the number sections. We propose that such loss can be alleviated when modulator designed directly on discrete phases. The feedback-based wavefront with genetic algorithm has been taken here. performance optimized four-phase metalens catches up continuous one and robust variations Experiments have confirmed its function. These results potential applications imaging

Язык: Английский

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Low frequency sound absorption metasurface optimization design method based on deep learning

Applied Acoustics, Год журнала: 2024, Номер 231, С. 110446 - 110446

Опубликована: Дек. 5, 2024

Язык: Английский

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